Method of manufacture of an enhanced boiling surface heat transfer tube and the tube produced thereby

摘要

A method of manufacturing an enhanced boiling surface heat transfer tube and the tube formed thereby includes the steps of forming fins (16) on the outer surface of a heat exchanger tube (15) by rolling, partially coining the fins on the tube utilizing knurling rolls (43), and finish coining the outer surface using burnishing rolls (44) to provide subsurface re-entrant cavities (33) in the tubing outer wall surface with re-entrant passages (34) communicating between the cavities and the tubing exterior surface. IMAGE